July 16, 2013: The Senate reached a deal to allow some presidential nominations to come to a vote, avoiding the "Nuclear option" for filibuster reform.[5]

September 24–25, 2013: Senator Ted Cruz delivered a 21-hour, 19-minute speech, one of the longest in Senate history, in opposition to the Affordable Care Act. Cruz's speech was not a filibuster, as it delayed no vote.[6]

October 1–17, 2013: The United States federal government was shut down as most routine operations were curtailed after Congress failed to enact legislation appropriating funds for fiscal year 2014, or a continuing resolution for the interim authorization of appropriations for fiscal year 2014.

November 21, 2013: In a 52–48 vote, the Senate ended the use of the filibuster on all executive branch nominees, as well as on most judicial nominees. The filibuster remained in place for Supreme Court nominees and for legislation.[7]

Senators are listed by state, and the numbers refer to their Senate classes, In this Congress, Class 2 meant their term ended with this Congress, requiring re-election in 2014; Class 3 meant their term began in the last Congress, requiring re-election in 2016; and Class 1 meant their term began in this Congress, requiring re-election in 2018.